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    <title>杨澎锴的实践作业</title>
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    <h1>文本样式属性和css盒模型基础</h1>
    <h1>Author:<span> Alexader</span></h2>
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        <h2 class="task">颜色和数字</h2>
        <h3 class="tast">颜色和数字对比</h3>
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      <h2>css盒模型</h2>
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        <li>设置盒子大小</li>
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      <div id="practice"><p> 练习怎么建立盒子练习怎么建立盒子练习怎么建立盒子练习怎么建立</p></div>
      <div class="deg">987654321</div>
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